在传递给google.setOnLoadCallback()的函数中使用参数;

I'm trying to use Google Visualization API to display data gathered from a MySQL server. I want to get the data using PHP and then pass it into the javascript function call to create a chart. When I do this, I'm having a problem passing parameters to the function passed to google.setOnLoadCallback();. I'm fairly new to web programming, so bear with me. The working code (pretty much from their docs) looks like this:

我正在尝试使用谷歌可视化API来显示从MySQL服务器收集的数据。我想使用PHP获取数据，然后将其传递到javascript函数调用中，以创建一个图表。当我这样做时，我有一个问题将参数传递给传递给google.setOnLoadCallback()的函数;我对网络编程相当陌生，所以请见谅。工作代码(大部分来自他们的文档)是这样的:

<html>
<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
  google.load("visualization", "1", {packages:["corechart"]});
  google.setOnLoadCallback(drawChart);

  function drawChart() {
    var data = new google.visualization.DataTable();
    data.addColumn('string', 'Year');
    data.addColumn('number', 'Sales');
    data.addRows(4);
    data.setValue(0, 0, '2004');
    data.setValue(0, 1, 1000);
    data.setValue(1, 0, '2005');
    data.setValue(1, 1, 1170);
    data.setValue(2, 0, '2006');
    data.setValue(2, 1, 660);
    data.setValue(3, 0, '2007');
    data.setValue(3, 1, 1000);

    var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
    chart.draw(data, {width: 400, height: 240, title: 'Company Performance',
                      hAxis: {title: 'Year', titleTextStyle: {color: 'red'}}
                     });
  }
</script>
</head>

<body>
  <div id="chart_div"></div>
</body>
</html>

I was trying to first see if I could set up the data outside of the drawChart() function and pass it as a parameter as so:

我想先看看能否在drawChart()函数之外设置数据，并将其作为参数进行传递:

<html>
<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
  google.load("visualization", "1", {packages:["corechart"]});

  var data1 = new google.visualization.DataTable();
    data1.addColumn('string', 'Year');
    data1.addColumn('number', 'Sales');
    data1.addRows(4);
    data1.setValue(0, 0, '2004');
    data1.setValue(0, 1, 1000);
    data1.setValue(1, 0, '2005');
    data1.setValue(1, 1, 1170);
    data1.setValue(2, 0, '2006');
    data1.setValue(2, 1, 660);
    data1.setValue(3, 0, '2007');
    data1.setValue(3, 1, 1000);

  google.setOnLoadCallback(drawChart(data1));

  function drawChart(data) {
    var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
    chart.draw(data, {width: 400, height: 240, title: 'Company Performance',
                      hAxis: {title: 'Year', titleTextStyle: {color: 'red'}}
                     });
  }
</script>
</head>

<body>
  <div id="chart_div"></div>
</body>
</html>

I'm not too sure why this doesn't work. What would be the best way to create the DataTable object using dynamically gathered data from a PHP MySQL call? Thanks for your time.

我不太清楚为什么这行不通。从PHP MySQL调用中动态收集数据，创建DataTable对象的最佳方法是什么?谢谢你的时间。

2 个解决方案

#1

The following are the steps to make it work:

以下是使其工作的步骤:

Place google.load and google.setOnLoadCallback in a separate script tag.
谷歌的地方。加载和谷歌。setOnLoadCallback放在单独的脚本标签中。
Use a function expression.
使用一个函数表达式。

Here is the working code:

以下是工作代码:

<html>
<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
  google.load("visualization", "1", {packages:["corechart"]});
  google.setOnLoadCallback(function() { drawChart(data1); });
</script>
<script type="text/javascript">

  var data1 = new google.visualization.DataTable();
    data1.addColumn('string', 'Year');
    data1.addColumn('number', 'Sales');
    data1.addRows(4);
    data1.setValue(0, 0, '2004');
    data1.setValue(0, 1, 1000);
    data1.setValue(1, 0, '2005');
    data1.setValue(1, 1, 1170);
    data1.setValue(2, 0, '2006');
    data1.setValue(2, 1, 660);
    data1.setValue(3, 0, '2007');
    data1.setValue(3, 1, 1000);

  function drawChart(data) {
    var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
    chart.draw(data, {width: 400, height: 240, title: 'Company Performance',
                      hAxis: {title: 'Year', titleTextStyle: {color: 'red'}}
                     });
  }
</script>
</head>

<body>
  <div id="chart_div"></div>
</body>
</html>

2 个解决方案

#1

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